Datasheet > S5T8701

S5T8701

更新时间： 2022-11-26 04:34:46

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S5T8701 数据手册

FLEX ^TMROAMING DECODER II

S5T8701

SYSTEM BLOCK DIAGRAM

Synthesizer

Programming Control

Receiver

Control

Host

Microprocessor

User

Interface

Receiver

S0/IFIN

LOBAT

38.4 or 40kHz Clock

15pF

S5T8701

Low Battery

Detector

15pF

Figure 1 : Example Block Diagram Using Internal Demodulator

When configured to use the internal demodulator, the S5T8701 connects to a receiver capable of generating a

limited (i.e. 1-bit digitized) 455kHz or 140kHz IF signal. In this mode, the S5T8701 has 7 receiver control lines

used for warming up and shutting down a receiver in stages. The S5T8701 has the ability to detect a low battery

signal during the receiver control sequences. It interfaces to a host MCU through a standard SPI. It has a 1minute

timer that offers low power support for a time of day function on the host.

When using the internal demodulator, the oscillator frequency (or external clock) must be 160kHz. The CLKOUT

signal can be programmed to be either a 38.4kHz signal created by fractionally dividing the oscillator clock, or a

40kHz signal creating by dividing the oscillator clock by 4.

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